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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd412c7e0bb61b9ee842b3327123db0ae662b675a2d3231e45c1e83f749b6b9' 
  AND token = 'kPpdT8XhNbyDBor22/aajpzmEb8cKp870yNKuUQsEXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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