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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d76913294b972d98f073f608ba69457a0b1541d9332d132d6e20f138a03236' 
  AND token = 'Yknwx+ywmWzD92GxqWTnTzSY4YaYSnKFCCkehYGyhOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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