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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fe5515a86089e915426a9165da0715f58161089288f2cdcb26935fda3a2236' 
  AND token = 'B+QXNQweZe/D028uHMBm+dBR1Y7I3asffCG7DAeHOfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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