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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d67d3089fc66bd643fb1e4b70a9ddc6a51e5543bfba227265e1ed0f3afd633' 
  AND token = 'iYEhpgtykuAMLLLf/ELqHGl400O24oM2Fq1tBZsZncs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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