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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ea1e5f3fe387b7fa35cb4e5f5d3b7ab6f7e2b74f6c2f0bad7adfeef631537e' 
  AND token = 'QL1Ib+SRyqxcQpdFvW1n5xSw1sFbY7zX2hHAs91+TBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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