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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cd62f0dbb12ed69f38d2e977fda71b739b43622db5a5bfd6837aef6e7e9724' 
  AND token = 'azt0wOMD6L0WeGE6Bofc0yooxbVBLnbLq2E+Xuuat4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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