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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdee4a1b6fb290b6576efdb3eddbb1ed315cecc9fbd8db024ffedc801db3caad' 
  AND token = 'lDoFFX7glgAYMN18MG0ozLsLu0yexm2tfEGQCo0u56I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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