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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e00d6ff87044c2f449a8ab7ac669bb9c698d73d61477e1cd876d955fcd3462d' 
  AND token = '3t/tqspJdmgaUnaVUlBZRZcMik7H114N+S9VJdLDRNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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