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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11f91030970fcac9da88e88af4880a5a108258e88d9a8b0971c88f2a32fc084' 
  AND token = 'MWzi2V3C+hx1mzoI7FDZi/NUyRXzbpweIQ3MMt1BJMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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