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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732c2e9211ede05dc126b0817c4357b991ce47764820530f7d48e6635d147914' 
  AND token = '/QNuCgHRAFqcDMdPLmkN1Dg76dizLpfaR5LJU+DE0Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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