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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d843222363233b3b01bec04b2a95d4529ee36b06b0a606cdaeac217f3f68470' 
  AND token = 'eMCI8gycVFnAPbn5M7cyDPbUc+O5LPpnuS/6tlY0asc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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