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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2731d16a2831e3d51be7a91b489581cc007d9189c634fe96756bd3b9fa56c88' 
  AND token = 'TOnbSLlMsuYnw9nqc2YkmQsgFx/01UHzrO5lnV4vXlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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