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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08c696452c8c8362ae3d6906d284b53f29e34b6c3a042078ba43e62452d60ed' 
  AND token = 'u75yvfSZ6/M+0Awt8c9T16f8Ghf4MLjo53hM6EBsQn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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