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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009230536b12d02834ad0e2bc4f087129bc367a6d2a3b7df939d9e80393b4c0c' 
  AND token = 'XEg6VFU4XEQBdLFAzM2d22nTaNfrI+aohqOD1fYvwu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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