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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35abd216c53107c50a938e19f3697acb05f4d8e5fb02ac53156260df190d5db5' 
  AND token = 'k1znHLQQ0+UN6a1Gfoysr4JenVLN+6VDp61B6WkVZsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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