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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c01c3cd161be5076366475ed7dddc533ee3c8c461fa2091cfe03aad154534e' 
  AND token = 'ddjuK23zr85T1Xd25an0wjTMv+HXCvW/9cg2lI54BkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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