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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad319244f1885ecefe22e2fe38efeab58bdd0ccb5f858c871eee014248257af0' 
  AND token = 'H4vXsW8IJYhB0+1M2fq68MyeMS1XDK4bpEsSURQjajo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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