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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05950e179bd43cf2e028a3dd5779bcd9f58f2d83dc21d323c834917a7f5cafca' 
  AND token = 'TAJRpDn8z0BQ5E7y9y94uA2GfBui5E5eb3GFwO+OM90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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