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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275a0d3232c9b5f0b1b9063a11dabcb385cda1cf41ef147973d35d8911a5c88c' 
  AND token = 'KX9pazHIXIYpQoJ+gjYo1LgfUUtiej/mMf2+EyO22rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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