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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95361f88b50caa760d122b2d67c267c3a7840522738f1563d7eb41c05c4cb863' 
  AND token = 'mTvlLrNWc90GZ3VZGK/Ir9XPwfSrP/G7e5orfcZIY4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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