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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89f0174d428bd0b4e6f35e34d3bd96049922a33f14e2abdb7a9bd85bc4aec1f' 
  AND token = 'Q1XfsNohkQechA18bcLpIRuJCbus+yZDnop8X9Fsbi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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