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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0f2c1d0770a2c3df80db6903766f34ec10acf55ef3c34277fc2c2a4ebac310' 
  AND token = 'j9D4X/o0IcvSvW8sutVSP17BOb9+8dXX9ZouBiWE4vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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