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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137be1257f14eb403c0ef9935fe1c311c9e0b9377f65d9b04c85734a8f087ee7' 
  AND token = 'Q4w6EKl/+4hqfepiTiFl+L7b5xKryjGUHfPcrEvgzZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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