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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb6eff22822ae5ae0d0ff707359c67a01a6afbc58523aa6cb10824d49075b8b' 
  AND token = '1Pl4jRZCJX5V7JklYsz1sGO2LLJn7qAplV6u96k+lDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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