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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07f3a696645b0a0c186b78da440859351ffe0faaad8808cd55831d48accdec3' 
  AND token = 'wEf+iaUHzT31qUiqvmMRn3KFhxT0lH4MUJ4U/WN9mwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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