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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5892c20dd0466f566cee26938dd226366862dfbadcb14a3171a1de3a896956' 
  AND token = '8aluD0l9Di8gm5XN3gXykGqKjI1PfEchg1ejOLMHF0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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