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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da799a458a43d27cd9fade02563623a14ab893048ae6575e50240a4be7a904b' 
  AND token = '9C0NpyqE/28PGVxf+Pfm0FKRL3mqMXmxDmL4a1ajqo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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