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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e4b9534b5c3a0f082f003cffeebd1eb52f8fd73cff9fd4dcff0d7d38c1e618' 
  AND token = '2RIta/giKuPue827Id+9pU+Qc+cUueMpwEys7Cl1/c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}