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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a3bfbefcbd64558f90453b4caef073a9fbc413b379b61a2bedc55e0eb093b6' 
  AND token = 'dVkw3SGTBcXnGtF8AxVXRI0I0/gv8zJWxuQIMeVYAB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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