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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5dc689c0f7c399fa673c5a8487ba23e359760ff746539119ec73a5a7677b69' 
  AND token = 'rFLIe0MEfs3CC0uy4cbtGmuxRry3LP7OJh1Y7z5/vWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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