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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbecb892d2bef06a7fd5a39d75d4d6eeb2c154a15d97216f4803242da7d6dc1d' 
  AND token = '8JRdtqOquzAj1BNwUfViEgnccDn6OHHNDPrM5naOHZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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