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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a96adab7373c4b85df66a0720e7c2c342b865cdd0ac2d0886e2460947d0499b' 
  AND token = '3oUcS7kZCz/T0zMe7rSW/xgcthS9euBF0zm7OAgHrnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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