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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0192e2f2c586cfb59ad21f77a552dd4e9fba470987bd1c77360c6c9fa6c70230' 
  AND token = 'wJBWBNP5r/Btae2phe1ndop3tfnArlfQ4X1shTM07lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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