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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cca2bc0f741fdc38adc797455f3e68a15d6541ec74090d94f84ff810001837' 
  AND token = 'gN4A4q5vX7IP4Tg02hlN4+36eTAyC4+8s2+6RPz0vx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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