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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e796c17c9beee41d412deb9e0a26e643095753be28553dd4e19ab728eab9beb' 
  AND token = 'VbZvIWnqb1RsMky4NvfJ5sVPqbjQR9P+PLidBNILAbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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