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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32953430acb3032c9b9fe14f33fa2da31a8ded99efa45141451b0d1119e7b2a4' 
  AND token = 'LF9v+y3P8QPE3ccrpi+wScGFZpwAa8RuJdwpIzDI2cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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