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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c410ff205107aa5602abf345cfe009023c073e52146df8d188711e0f29f5e4' 
  AND token = 'DmQUM87+SmP3x5mUKdazy/rzC7RpE5MmJPFpQojoL9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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