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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b4da14ce5f5da8dbd8b8c4b536aacadc4dc59a676bc57ba087a2df99bc4bae' 
  AND token = 'tYZ4CsxUkEtg+F7Lio9q65Ft0k+iZotfpLWWT/665tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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