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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c978e0ab75534dfc6bb72e5ce9649e9892a607f3842ab44db2cd5af6c90103ba' 
  AND token = '23hR0+fGAi60YYPJv30ZJvdy9kPTUXBfn6XYUKRqTRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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