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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0174d0146918f6d344d6ced34e8e5a6f91b1222a53da6c20c5b422a62ac64956' 
  AND token = 'vJ2tMh1Fwth0uI30mstnsFlrrXrKGramzN9dAmawnZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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