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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fc97ada43ab6ef5943818aaa4a2240de9c667509c7c6627ec688824720a4dd' 
  AND token = 'e6pAAxOmN6rIilGcEdFe1ECWvcJByhaYN13yfuDYAgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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