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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78cae18c09432601b0a6d63704778893182753e4134a64a1105ffb6c70f0b330' 
  AND token = 'mTs/gyyjAeVMUCRGJDAbDIaqPDIKEYB9eBktW1Ml2NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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