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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80d6c6272b53c62deab6164d3ea0923e9b1ce5864c39c229cca016817fbebe7' 
  AND token = 'dK/ypE7kBd5GrhOYWYr1UMC2J+mWPTRZmMnUfuwoln0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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