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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2067377c6f0cdccab591da50e1885fcd51552a3d0e42002f5e3a84fc3cd72027' 
  AND token = '4uPGeTVpg099afU2+UG6ybybetnap0GdqtQ4XdFPcDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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