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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f56deb7eecedc4c85ae8afbbc8fdbfffd32521a564764af1e9e9386929f9256' 
  AND token = 'I7CyHw1CNyA+gU3chsohq5KwJ1fPHlp7Lk6ewPPewbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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