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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefea9c781a941c150ee5de445f9779844f7fbd3dd8fa2a27aef7a4a49038c0d' 
  AND token = '83RReNoALMca1EtnHEsEg0FFW8MUetEO/W2xwWiDbz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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