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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814b527b74a840f3732c776c5ed7e661775ea851416f90c58520df109a44f388' 
  AND token = '7G/MVNBh41vxXpgMjETzm5e4cr06CcnZk6l3Dmbvhn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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