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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db756953158973d19e2fcb92185d3ed7784cadced18b045c2a15fb1877f71bbf' 
  AND token = '3Lq4ulx/jaebiTyjlFkHSYknsoUeHHJe6hg1Rjba02o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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