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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe308f291f9800f04a64ad9fc415785bd8b04bd4c0bdf86a8d543005fed2d933' 
  AND token = 'cJc7asLj1jNly/RCdKh+vPbvm1/iLzOqW+Syd3g6p0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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