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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8baaf5cf5de9cc020e74ba89379d81ee22ad7070b9710a64ed5c1d38a6bf235f' 
  AND token = 'hAITI8rPcCikLGLtKaW2QaHTbSx9njXb08eBDEcJtd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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