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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e37df93a94e489c2f97c85f881cd188cf8a44622b308f0f9bbe6690c8d6688b' 
  AND token = 'umQmSy+91eNWPvod/Basz5slYhcyrRANhVaSGmmKJsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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