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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caaf9d013243f2f8cb079bd1aa43a2aae9c537cccdf14f7c8ef84ee98ab2c07d' 
  AND token = '2iXzZjARRtRk3q9XLNlkwAtnAWyhfiIzApTo5y71y5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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